Fuel-controlling means for internal-combustion motors



April 21, 1931. J. F. BJORKGREN 1,802,043

FUEL CONTROLLING MEANS FOR INTERNAL COMBUSTION MOTORS erv Tag QWMW Patented Apr. 21, 1931 UNITED STATES PATENT OFFICE FUEL-CONTROLLING MEANS FOR INTERNAL-COMBUSTION MOTORS Application filed July 16, 1928, Serial No. 293,282, and in Sweden April 10, 1926.

The present invention refers to fuel controlling means for internal combustion motors provided with a fuel pump, which is driven directly or indirectly from the motor shaft, and the length of stroke of which is automatically controlled through a centrifugal governor driven bythe said shaft.

The object of the invention is to bring about i a sure and economical control of the fuel.

The invention consists primarily in the feature that the driving device for the fuel pump is provided with twoseparated, co-ax- .ially arranged and movable rods, one of which is connected with the fuel pump and the other with a device driven by the motor shaft, a segment actuated by the governor being movably arranged between the said rods.

An embodiment of an arrangementaccord ing to the invention is illustrated by way of example in the accompanying drawings. Fig. 1 is an elevation of the arrangement, and Fig. 2 a vertical section thereof through the shaft of the motor. Fig. 3 is a vertical section of a portion of the arrangement in a plane at right angles to the motor shaft.

In the drawing, 1 designates the crank casing of the motor and 2 the motor shaft journalled therein. Provided on the crank casing 1 is the governor casing 3 having the governor spindle 4 mounted therein, said spindle being driven from the motor shaft 2 through a beveled gearing 5, 6. Attached to the upper end of the spindle 4 is a pendulum attachment 7 having pendulums 9 swingably secured thereto by means 'of bolts 8, said pendulums carrying the weights 10. The pendulums 9 are provided with inwardly directed arms 11 having on their upper sides small cap-like abutments 12 bearing against a plate 13 movable in the axial direction of the spindle 4, said plate being rigidly connected with a sleeve 16 by means of bolts 14, said sleeve 16 being axially displaceable on the spindle 4 and provided with an annular flange 15. The bolts 14 extend through holes in the pendulum attachment 7 as will be seen from Fig. 3. Resting on the upper side of the plate 13 through the medium of a thrust ball bearing 17 is a sleeve 19 provided with a flange 18, said sleeve being guided by a pin 20 projecting from the plate 13. Inserted between the .flange 18 of the sleeve 19 and a flange 21 of a 26 secured to the outer end of the screw and situated outside the casing 29, said handle having a springlocking device 27 provided therein and adapted to lock the handle 26 in different positions of adjustment by engagement with the teeth of a locking plate 28 attached to the upper part of the casing.

Secured on the outside of the casing 29 is a guiding frame 30 having a rod 31 displaceably arranged therein, said rod being con nected with the plunger 32 of the fuel pump (not shown). The lower part of the rod 31 is forked and embraces a segment or plate 33 which is pivotally connected with the rod shanks by means of a. screw 34. The screw 34 is formed at the one end into a squarehead 35, which is displaceable in a rectangular hole 36 in the one rod shank, so that the screw 34 may also be displaced to a certain extent, together with the plate 33, relatively to the rod 31. The lower end of the segment 33 is circular with the centerdisposed on the axis of rotation of the screw 34, whereas the upper end of the segment 33 is of a circular shape eccentrically disposed relatively to the lower end. The upper end of the plate 33 cooperates with a knife edge 37 formed at the bottom of the rod fork and is kept constantly pressed thereagainst by a stud 38 which is attached to the. rod 31 and is guided in a slot 70 in the segment 33 concentrically with the contour of the upper end of said segment.

Secured on the governor casing 3 is a sec- I ond guiding frame 39 having a second rod 40 displaceably arranged therein, said rod being driven from an eccentric 41 secured on the motor shaft 2, the strap 42 of said eccentric being pivotallyconnected with the rod 40 by means of a bolt connection 43. The eccentric 41 is adjustably arranged on a sleeve 44 secured on the motor shaft and. is locked by means of a screw 45 provided with nuts and arranged in a cam slot 46 in .a flange 47 of the sleeve 44. The moment of injection of the fuel pump -may be altered by an adjust ment of the eccentric 41. The rod 40 actuates the lower end of the plate or segment 33 and will thus also actuate the plunger 32 of the fuel pump through the medium of the rod 31. I

Movably connected with the segment 33 is a forked arm 48, the free end of which is pivotally connected with the one arm 49 of a bell crank lever pivotally secured on the governor casing 3. The other arm 50 of said lever is forked and embracesa ring 52 with which it is pivotally connected by means of screws 51, said ring 52 being rotatably mounted on the sleeve 16 displaceably arranged on the governor spindle 4. -The ring 52 is retained between the flange.15 of the said sleeve 16 and a ring 53 screwed onto the other end of the sleeve.

The upward movement of the rod 31 with the plunger 32 corresponding to the pressure stroke of the pump is effected through the medium of the segment 33 by the rod 40 driven by the eccentric 41, whereas the downward movement of the plunger corresponding to the suction stroke is effected in known manner by means of a spring (not shown). The magnitude of the'latter movement may be altered through the medium of a bolt 54 pivotally mounted in the guiding frame 30, said bolt 54 extending through an elongated hole in the rod 31 where it is formed into an eccentric pin 56 limiting the downward movement of the rod 31 and permitting, ac-

cording to the adjustment thereof, a greater or smaller movement in the said direction.

Moreover, an abutment 57 or the like is attached to the rod 31, said abutment cooperating with the one shorter armof a bell crank lever 58 pivotally mounted on the frame 30, through which bell crank lever the fuel pump may be actuated manually.

In starting and at lower speeds, the centrifugal governor and the segment 33 actuated by the same nearly assume the position shown in the drawing, in which the distance between the contact points between the upper and the lower end of the segment and the knife edge 37 on the rod 31 and the rod 40 has practically its greatest value, and on account of this the length of stroke of the fuel pump also obtains its greatest value.

If the speed is increased, the pendulums 9 with their weights 10 are swung outwardl v, and the plate 11 is raised against the action of the spring 23. The sleeve 16 with the ring 52 will then also be raised, the lever arm 49 with the link 48 and the segment 33 swing-- ing outwardly. The segment 33 will then slide with its upper eccentric end toward the hit the latter at a later moment, which re-' sults in a decrease of the length of stroke of the fuel pump. If the speed is further 1ncrease-d, the segment 33 is swung still more outwardly, its effective length and thus the length of the pump stroke being further decreased.

An increase of the length of stroke of the pump may be effected either by turning the screw 54 with the eccentrically arranged pin 56 in such a manner that the rod 31 with the plunger 32 may be displaced further down, or by adjusting the controlling handle 26 so that the spring 23 is strained, whereby the pendulums 9 with their Weights 10 are deflected inwardly while the plate 11 and the sleeve 16 are lowered, so that the segment 33 is swung inwardly through the lever and link connection 50, 49, 48, the effective length of the segment being thereby increased.

A safe and economical fuel control is brought about by the rod 40 being in contact with the segment 33 only during a portion of each revolution, the governor being thus free during the remainder of the revolution.

\Vhat I claim is 1. In fuel controlling means for internal combustion motors provided with a fuel pump which is driven directly or indirectly from the motor shaft and the length of stroke of which is automatically controlled by a centrifugal governor driven by the said shaft, driving means for the fuel pump comprising two separated, coaxially arranged and movable rods, one of which is connected with the fuel pump and the other with a device driven by the motor shaft, an abutment on one of said rods, a tiltable curved segment actuated by the governor and arranged between the said rods and being further pivotally and displaceably connected with the abutment carrying rod, and guide means permitting of a tilting movement of said se ment and keeping the segment in constant contact with said abutment.

2. Means as claimed in claim 1 wherein an abutment is adj ustably arranged in the guide means for cooperating with the rod which is connected to the fuel pump, said latter abutment limiting the movement of the rod in a direction corresponding to the suction stroke of the fuel pump.

In testimony whereof I afiix my signature.

JOHAN F REDRIK BJORKGREN.

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